如果你画出所有现代海龟和陆龟的族谱，就会发现，几乎所有乌龟分支都隶属于水栖物种。
If you draw out the family tree of all modem turtles and tortoises, nearly all the branches are aquatic.
原颚龟化石（Proganochelys quenstedti） 和古老陆地龟化石（Palaeochersis talampayensis） 这两种重要化石最早可以追溯到恐龙时代，它们与所有现代海龟和乌龟的祖先最为接近。
There are two key fossils called Proganochelys quenstedti and Palaeochersis talampayensis dating from early dinosaur times, which appear to be close to the ancestry of all modem turtles and tortoises.
在几个亚纲（或生物学的“目”）的爬虫类中，有蛇和蜥蜴、乌龟和陆龟、鳄鱼和短吻鳄以及虫蜥蜴——一种现存于新西兰的海蜥蜴。
Among the several subclasses (or "orders" in biology) of reptiles are snakes and lizards, turtles and tortoises, crocodiles and alligators, and the tuatara, a marine lizard in New Zealand.
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